v3.26.1
Securitization Activities and Consolidation - Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Assets [Abstract]    
Investment securities, at fair value $ 75,939 $ 85,412
Other Assets 29,628 26,566
Assets 3,505,318 3,497,598
Outstanding balance of the guarantor advance (300) (400)
Liabilities [Abstract]    
Other Liabilities 11,587 11,595
Variable Interest Entity, Not Primary Beneficiary    
Assets [Abstract]    
Investment securities, at fair value 10,810 12,006
Other Assets 5,034 5,257
Assets 478,239 487,914
Maximum Exposure to Loss 413,985 422,902
Liabilities [Abstract]    
Other Liabilities 4,990 5,120
Variable Interest Entity, Not Primary Beneficiary | Other    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 6 7
Assets 61 64
Maximum Exposure to Loss 14 15
Liabilities [Abstract]    
Other Liabilities 0 0
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment    
Assets [Abstract]    
Investment securities, at fair value 6,555 6,954
Other Assets 338 333
Assets 151,297 152,832
Maximum Exposure to Loss 121,710 123,364
Liabilities [Abstract]    
Other Liabilities 1,309 1,307
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | Securitization products    
Assets [Abstract]    
Investment securities, at fair value 1,416 1,451
Other Assets 157 162
Assets 29,528 30,025
Maximum Exposure to Loss 24,180 24,604
Liabilities [Abstract]    
Other Liabilities 491 498
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | Guarantees of Fannie Mae securities    
Assets [Abstract]    
Investment securities, at fair value 5,139 5,503
Other Assets 81 74
Assets 97,155 98,370
Maximum Exposure to Loss 97,525 98,754
Liabilities [Abstract]    
Other Liabilities 710 675
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | CRT products    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 100 97
Assets 24,614 24,437
Maximum Exposure to Loss 5 6
Liabilities [Abstract]    
Other Liabilities 108 134
Variable Interest Entity, Not Primary Beneficiary | Multifamily    
Assets [Abstract]    
Investment securities, at fair value 4,255 5,052
Other Assets 4,690 4,917
Assets 326,881 335,018
Maximum Exposure to Loss 292,261 299,523
Liabilities [Abstract]    
Other Liabilities 3,681 3,813
Variable Interest Entity, Not Primary Beneficiary | Multifamily | Securitization products    
Assets [Abstract]    
Investment securities, at fair value 4,255 5,052
Other Assets 4,656 4,886
Assets 324,122 332,572
Maximum Exposure to Loss 292,245 299,507
Liabilities [Abstract]    
Other Liabilities 3,661 3,792
Variable Interest Entity, Not Primary Beneficiary | Multifamily | CRT products    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 34 31
Assets 2,759 2,446
Maximum Exposure to Loss 16 16
Liabilities [Abstract]    
Other Liabilities $ 20 $ 21